XML 606 R127.htm IDEA: XBRL DOCUMENT v3.10.0.1
Financial risk management - Fair value estimation (Details) - Level 2 of fair value hierarchy [member] - GBP (£)
£ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Capital risk management and fair value estimation    
Financial assets (liabilities), at fair value £ 5,966 £ 2,976
Derivatives used for hedging: | Interest rate swap    
Capital risk management and fair value estimation    
Financial liabilities, at fair value   (655)
At fair value through profit and loss: | Forward foreign currency contracts    
Capital risk management and fair value estimation    
Financial liabilities, at fair value   (1,253)
Embedded foreign exchange derivatives | At fair value through profit and loss    
Capital risk management and fair value estimation    
Financial assets, at fair value 624 1,714
Forward foreign currency contracts | At fair value through profit and loss    
Capital risk management and fair value estimation    
Financial assets, at fair value 852 £ 3,170
Interest rate swap | Derivatives used for hedging:    
Capital risk management and fair value estimation    
Financial assets, at fair value £ 4,490